In my previous message I was thinking C-c BACKSPACE and C-c DELETE by
mistake. Those, by analogy, would make sense for major modes to bind.
C-BACKSPACE is a different issue.
Other programs allow C-<backspace> to delete backwards a word and
C-<delete> to delete forwards a word. (Like C-<left> and C-<right>
which move by words.)
This is in fact what C-BACKSPACE and C-DELETE do in Emacs. So major
modes should not change them, unless to a mode-specific better way to
delete words.

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